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    // 冒泡排序
    var arr = [6,5,3,2,1,9,6,4,3,2,5,1,15,28];
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        for ( var j = 0; j <= arr.length -i -1; j++) {
            if (arr[j] > arr[j+1]) {
                var  temp = arr[j];
                arr[j] =arr [j+1];
                arr[j+1] = temp;
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